package com.mmall.common;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.concurrent.TimeUnit;

/**
 * Created by Administrator on 2017/5/24 0024.
 */
public class TokenCache {

    private static Logger logger = LoggerFactory.getLogger(TokenCache.class);

    public static final String TOKEN_PREFIX="token";

    //guawa 里边的本地【缓存】| 设置缓存的初始化容量为1000，设置缓存的最大容量、当超过这个容量时会使用（LRU算法）最小使用算法来移除缓存项
    //设置缓存的有效期是12小时
    private static LoadingCache<String, String> localCache = CacheBuilder.newBuilder().initialCapacity(1000).maximumSize(10000).expireAfterAccess(12, TimeUnit.HOURS)
            .build(new CacheLoader<String, String>() {
                //默认的数据加载实现，当调用get取值的时候，如果key没有对应的值，就调用这个方法进行加载
                @Override
                public String load(String s) throws Exception {
                    return "null";
                }
            });

    public static void setKey(String key, String value) {
        localCache.put(key, value);
    }

    public static String getValueByKey(String key){
        String value= null;
        try {
            value = localCache.get(key);
            if ("null".equals(value)){
                return null;
            }
            return  value;
        }catch (Exception e){
            logger.error("localCache get error",e);
        }
        return null;

    }
































}
